JAVA List 对象排序

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

public class Rank implements Comparator{
public static void main(String[] args) {
List<String> timList=new ArrayList<String>();
timList.add("9");
timList.add("4");
timList.add("1");
timList.add("6");
Rank rank=new Rank();
Collections.sort(timList,rank);
for (int i = 0; i < timList.size(); i++) {
String orderString=timList.get(i);
System.out.println(orderString);
}

}
public int compare(Object arg0, Object arg2) {
String tString=(String) arg0;
String tString2=(String) arg2;
int flag=tString.compareTo(tString2);
return flag;
}
}